Answer: He thinks they have already made it to the Lonely Mountain and that their journey is over when in reality it's still the very beginning and many dangers are still ahead.
What is significant about Bilbo's question "Is that The Mountain?"

The reference in question comes when Bilbo visits the dragon Smaug's treasure hoard within the Lonely Mountain: "To say that Bilbo's breath was taken away is no description at all. There are no words left to express his staggerment since Men changed the language that they learned of …

The Hobbit or There and Back Again is a children's fantasy novel by English author J. R. R. Tolkien.It was published on 21 September 1937 to wide critical acclaim being nominated for the Carnegie Medal and awarded a prize from the New York Herald Tribune for best juvenile fiction. The book remains popular and is recognized as a classic in children's literature.

Gollum - Wikipedia

The Hobbit - Wikipedia

Themes of The Lord of the Rings - Wikipedia

Themes of The Lord of the Rings - Wikipedia

The Tolkien critic Richard C. West writes that the story of The Lord of the Rings is basically simple: the hobbit Frodo Baggins's quest to take the Dark Lord Sauron's Ring to Mount Doom and destroy it. He calls the quest "primary" along with the war against Sauron. The critic David M. Miller agrees that the quest is the "most important narrative device" in the book but adds that it is ...

Gollum is a fictional monstrous character from J. R. R. Tolkien's Middle-earth legendarium.He was introduced in the 1937 fantasy novel The Hobbit and became important in its sequel The Lord of the Rings.Gollum was a Stoor Hobbit of the River-folk who lived near the Gladden Fields.Originally known as Sméagol he was corrupted by the One Ring and later named Gollum after his habit of making ...

The music of The Hobbit film series is composed and produced by Howard Shore who scored all three The Lord of the Rings films to which The Hobbit trilogy is a prequel. The score continues the style of The Lord of the R...